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Alright I get it now,
thank you everyone.
Regarding the merge node question
I was thinking about when you want to perform actions in an order does the merge node provide that, as in nodes connected to it execute in order from the first to last

Why is it that after you used the gas match field node which creates the non-existent "mask" field there's a wrangle ode which does the same ?
Also do merge nodes run their child nodes in order from left to right ?
This next question is unrelated but how do I copy or transfer a field or data from one object to another ?

Thanks for replying, really appreciate it
So your saying that even thought the description for the field parameter says :
"The name of a field that one wants to create. If it doesn’t exist, one will be created. This can be a space separated list of fields to create many fields in one DOP." , instead it only just makes field and doesn't modify them.
Ok then. But in that case how would I go about matching an existing field to another
And also I really have to know, on the second picture am I even referencing these field the right way, I mean the path to them and all that

Hi I'm new to Houdini and recently I've been getting into DOPs.
I have a question
I've been trying different things out in dops to see how they work,
been playing around with the "Gas Match Field" node and found that it works quite nicely when both fields you are supplying the node with are from the same object
Like on picture 1, both the "myField" field and the "heat" field are part of the same object and the node works just fine
But what I can't figure out is how to make the node work when I'm supplying it with fields from different objects. On picture 2 "myField" is part of an empty object and the "heat" field is part of the smoke object, I tried to reference them
via their paths like on the picture 2 but unfortunately it doesn't seem to work.
Does anyone have any insight into why this may be,
I can see how referencing field from different objects can come in handy not just for this scenario.

Is the thing that is stopping my gas nodes from executing the fact that I use multiple objects and somehow mess up the syntax when referencing fields from other objects.
Well to me it makes sense to in the gas match field node reference one field from the rbdobject as
/obj/Smoke_Simulation/dopnet1:rbdobject1/temperature_mask
and then reference the other field for the reference like
/obj/Smoke_Simulation/dopnet1:smokeobject1/temperature
is this where the problem is, that one field in on one object and the other on another object
I see that you always make all your fields part of one object, is it impossible to put fields on different objects and then make gas nodes perform operations on field that exist on different objects

I'm trying to make a temperature field for my geometry
I want this field to have the same values as the smokes temperature but only subtracted by an amount.
Starting from the smokes temperature field I'm trying to isolate only the voxels inside the geometry and then subtract their values.
I've listed all my questions inside the dops node
Looking at what you've done raises another question for me
I see that you import volumes using the source volume node and then wire them into the last input on the solver even including masks.
Is the thought process when importing fields from sops
Use "Source Volume" set it to maximum and make sure that on the sops to dops bindings tab it binds to a field of and object you want to apply it to
Or is the thought process of importing volumes from sops
Use the "sopscalarfield" node and then use the apply data to apply it to your object
also why is it that none of gas nodes get executed

Please, I just need a couple of pointers
I've been trying to set-up a pyro simulation, have some smoke rise up and collide with an rbdobject.
I've uploaded my hip file and written all my questions and problem explanations in there.
Plus I think that it's much easier to understand if you have my hip file instead of me trying to explain it here in text form. Please take a look at it.
The gist of it is :
The smoke has a temperature field. And I've wanted to lower the temperature field of the smoke that comes in contact with the geometry so I've come up with the idea to give the geometry it's own temperature field and tick the temperature merge option on the pyro solver. In order to create the geometries temperature field I plan to make a volume mask to mask out the smoke's temperature field so that i'm only working with the voxels that make up the geometry and then lower their values, the result will then be the geometries temperature field.
I've listed all the problems and explanations inside the hip file please take a look
Any suggestion is greatly appreciated
Thank you
Houdini_DOPs_pls_help.rar

Hello everyone,
I've been getting into DOPs recently and i just cant figure out something.
I have a SmokeObject and an RBD object. They are both plugged into the Pyro solver.
The smoke has a collision relationship with the RBD object, and the Pyro solver's option "Temperature Merge" is set to "Collision Interior".
In order for the "Temperature Merge" to happen the RBD object has to have a temperature field.
Now what i want is for the RBD object's temperature field is to be just like what the smoke's temperature is but subtracted by a number so that the RBD object is always cooling the smoke.
I've Created a fog volume that consists only of value 1 voxels inside the RBD Object and value 0 voxels outside of the RBD Object.
I'm planning on using this as a mask for the smoke's temperature field (multiplying these two fields) and then lowering the value for all the kept voxels.
Now i don't know what is the best way of achieving this but i thought that I can bring in the mask field (the only 1 or 0 field) into the dop network using the "Sop Scalar Field Node" and then extract the temperature field out of the SmokeObject using the "Fetch Data Node", wiring these two into the "Gas Calculate Node" and then blending and doing post subtraction in there.
I don't even know if that is the right way to do it, but anyway once I connect the scalar field (the temperature mask, brought in from sops) into the gas node everything is ok. Once i plug in the data (SmokeObject's temperature field) into the gas node it reports an error saying that the connection to the fetchdata node is the wrong type.
How could this be? Both the "SopScalarField" and the "FetchData" nodes output data, how come that the gas calculate will accept data coming from the "SopScalarField" node and not from the "FetchData" node ?
I've been trying to resolve this for a while now, if anyone could help out it would be greatly appreciated

Thank you j00ey, now i can finally create a detail array attribute and was able to progress a bit.
Now i'm stuck at trying to make the array carry on through frames. Currently i am trying to create a for loop that will do the calculations for all previous frames, if i try out creating the detail array inside a solver even though it gets created at the end of the tree will it persist from the prev_frame node to the next frame ?

when I declare an array like this
int Glitched_Group[] = array();
and then use
push(Glitched_Group, @ptnum);
when i print out the array it just prints 1 for the first element and 0 for all others
also how will i go about transfering this array to another wrangle node

Ok, that explains allot. f1480187 demonstrated that with the solver node from the rising file. I'll have to look into the sop solver and solvers in general. So am i correct in saying I will be able to acess value's from any time step and frame inside a solver. Should i just recreate my idea inside a solver ? Well i'm sure it's not as simple i'll look into it some more later.